The antenna is a passive body that does not require

by:Rayoptek     2020-07-03
Gain antenna characteristics of a generic representation, it refers to the strength gain in one area relative to the following two ideal standard transceiver mode, ideal standard transceiver mode first, issued from an isotropic antenna radiator of energy, it is a the body of isotropic radiation, emitted in any direction in space, all directions are 0dB, calculated according to this standard as a reference gain units dBi, another ideal standard transceiver module based on a free space half-wavelength dipole radiation out of energy as a reference, and calculated the benefits of the unit is dBd, obviously the latter radiator former radiator gain, calculated as 2.16, ie 1 dBd = 2.16 dBi, at present most of the antenna using dBi calculation unit, 2.4GHz a typical gain of 2 dBi to 26 dBi. Only as an alternative antenna gain of a reference, it can only show the direction of energy strongest gain, but did not provide any energy distribution of radiation maps can be accurately display the distribution of energy in free space, commonly used for the level of radiation distribution diagram (horizontal / azimuth sweep plane) and vertical radiation maps (content verticalCompare / elevation sweep plane) two kinds of 8dB omni-directional gain antenna OP2408 horizontal and vertical radiation distribution diagram, the red line (H-plane) for the horizontal distribution, the fantasy you from the antenna the vertex beheld the signal coverage, you will find the 8dB omni-directional gain antenna the energy in the antenna as the center of a 360-degree four weeks payment; blue line (E plane) for the vertical distribution of, fantasy, you beheld the signal from the antenna next to the cover situation, only the energy at the same level of payment to go out, but the signal does not radiate to the sky or the ground. Not all users can understand the radiation distribution map, so accustomed to another to simplify effective parameters to describe the energy distribution, which was half-power beam width '(3dB Beamwidth or half power Beamwidth), referred to as beam width calculation for the width between the half of the maximum power of the two emission direction, which we usually call this radiation as the 'main lobe', the width of the lobe can be subdivided into both horizontal and vertical, according to the calculated the vertical beam width, angle of 16 degrees.
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